Impact of pore structure on hydroxyapatite supported nickel catalysts (Ni/HAP) for dry reforming of methane
Impact of pore structure on hydroxyapatite supported nickel catalysts (Ni/HAP) for dry reforming of methane
复制标题
孔结构对用于甲烷干重整的羟基磷灰石负载镍催化剂（Ni/HAP）的影响
DOI：
10.1016/j.fuproc.2020.106359
复制
发表时间：
2020-06
影响因子：
7.5
通讯作者：
Wang Xiujun
中科院分区：
文献类型：
--
作者：
Li Bin;Yuan Xiaoqing;Li Baitao;Wang Xiujun
多级结构载体由于其传质性能和大比表面积的合理结合，引起了化学家们在催化领域的广泛研究兴趣。本文制备了羟基磷灰石（HAP）负载镍催化剂，并将其用于甲烷干重整反应。在制备过程中，通过加热温度（20、50、80、120 °C）调节HAP中的中孔/大孔比例。孔结构对调节催化剂的理化性质起着重要作用，从而影响催化剂在DRM中的性能。随着HAP中孔比例的增加，Ni优先分散在中孔通道中，形成小尺寸颗粒。所有催化剂都具有较弱的相互作用，但随着Ni颗粒直径的减小，相互作用逐渐增强。高比例的大孔导致大尺寸的Ni纳米颗粒，而高比例的2-5 nm的小尺寸中孔导致这些孔结构的完全堵塞。这两种边界情况导致镍颗粒和载体之间的相互作用相对较弱，金属分散度低，因此活性低，以及DRM评价中的快速失活。Ni纳米粒子在HAP-80和HAP-120载体上具有较高的分散度，使这两种催化剂具有较强的抗烧结能力和抗积炭能力，在DRM评价中表现出较好的催化活性和稳定性。所有催化剂在重整反应过程中的失活主要归因于Ni纳米颗粒的烧结以及石墨碳的包覆。
The hierarchical supports have motivated intensive research interests of chemists in the catalytic field because of the rational combination of mass transport property and large surface area. In this work, hydroxyapatite (HAP) supported nickel catalysts were prepared and employed to promote the dry reforming of methane (DRM). The proportion of mesopore/macropore in HAP was adjusted by the heating temperature (20, 50, 80, 120 °C) during the preparation process. The pore structure played an important role in regulating the physiochemical properties and thus affecting the catalytic performance in DRM. With increasing the proportion of mesopore on HAP, Ni preferentially dispersed on mesopore channel to form small-size particles. All catalysts possessed weak interaction between Ni nanoparticles and HAP; however, the interaction enhanced gradually with decreasing the Ni particles diameter. High proportion of macropore led to large-size Ni nanoparticle, while high proportion of small-size mesopore at 2–5 nm resulted in the complete blockage of these pore structures. These two boundary situations led to relatively weak interaction between nickel particles and the support, low metal dispersion and hence low activity as well as rapid deactivation in the DRM evaluation. Ni nanoparticles on HAP-80 and HAP-120 supports possessed relatively higher dispersion, which imparted these two catalysts with the function of strong anti-sintering ability and carbon resistance, thereby exhibiting better catalytic activity and stability in DRM evaluation. The deactivation of all catalysts during the reforming reaction was mainly ascribed to the sintering as well as encapsulation of Ni nanoparticles by graphitic carbon.
登录
查看更多内容
影响因子：
5.3
作者：
B. Vasconcelos;D. Minh;P. Sharrock;A. Nzihou
通讯作者：
B. Vasconcelos;D. Minh;P. Sharrock;A. Nzihou
影响因子：
4.2
作者：
Lu Yao;M. Gálvez;Changwei Hu;P. Da Costa
通讯作者：
Lu Yao;M. Gálvez;Changwei Hu;P. Da Costa
影响因子：
5
作者：
K. Tomishige;Dalin Li;M. Tamura;Y. Nakagawa
通讯作者：
K. Tomishige;Dalin Li;M. Tamura;Y. Nakagawa
影响因子：
2.6
作者：
Jian Li;Haishun Wu;Bo Ma
通讯作者：
Jian Li;Haishun Wu;Bo Ma
影响因子：
22.1
作者：
Boukha, Zotihair;Jimenez-Gonzalez, Cristina;Lopez-Fonseca, Ruben
通讯作者：
Lopez-Fonseca, Ruben